1 files changed, 16 insertions, 9 deletions
diff --git a/crypto/src/crypto/io/MacSink.cs b/crypto/src/crypto/io/MacSink.cs
index aa72e9047..cc5d93b37 100644
--- a/crypto/src/crypto/io/MacSink.cs
+++ b/crypto/src/crypto/io/MacSink.cs
@@ -4,20 +4,17 @@ using Org.BouncyCastle.Utilities.IO;
 
 namespace Org.BouncyCastle.Crypto.IO
 {
-    public class MacSink
+    public sealed class MacSink
         : BaseOutputStream
     {
-        private readonly IMac mMac;
+        private readonly IMac m_mac;
 
         public MacSink(IMac mac)
         {
-            this.mMac = mac;
+            m_mac = mac;
         }
 
-        public virtual IMac Mac
-        {
-            get { return mMac; }
-        }
+        public IMac Mac => m_mac;
 
         public override void Write(byte[] buffer, int offset, int count)
         {
@@ -25,13 +22,23 @@ namespace Org.BouncyCastle.Crypto.IO
 
             if (count > 0)
             {
-                mMac.BlockUpdate(buffer, offset, count);
+                m_mac.BlockUpdate(buffer, offset, count);
+            }
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        public override void Write(ReadOnlySpan<byte> buffer)
+        {
+            if (!buffer.IsEmpty)
+            {
+                m_mac.BlockUpdate(buffer);
             }
         }
+#endif
 
         public override void WriteByte(byte value)
         {
-            mMac.Update(value);
+            m_mac.Update(value);
         }
     }
 }